Squeegee for screen process printers for printing of dielectric and metallic pastes for single and multilayer hybrid circuits

摘要

A squeegee is utilized in a screen process printer for microcircuits and components thereof. The type is one in which the squeegee and a flat stationary screen are mounted with the squeegee movable and in a wiping action makes contact with the screen so as to press a paste through openings of the screen in a predetermined pattern onto an adjacent substrate. The squeegee comprises a cylindrically shaped object of a predetermined length having a surface covering made of a resiliently deformable material. Further, the squeegee has an external cross-sectional geometric pattern such that a first surface is pushed against the paste in the wiping action. A lower edge of the first surface is above the surface of the screen a predetermined distance, and the first surface is at a predetermined fixed angle with the screen thereby causing a spreading action of the paste on the screen surface. The geometric pattern further has a second surface whereby a lower edge of the second surface is in pressure contact with the screen, and further wherein the angle of the second surface to the screen is less than the angle of the first surface to the screen, thereby providing a high hydraulic pressure forcing the paste into the screen openings.